Willaed l



(No Model.)

W. L. HALL.

LIPTING JACK. No. 298,374. Patented May 13, 1884.

.11 ttorneyr MJETERS, PMDUW. Walling! D, C-

NITED STATES WILLARD L. HALL, OF-FREMONT/NEBRASKA.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 298,374, dated May 13, 1884-.

' Application filed March 2), 1884. (No model.)

To all whom it may concern..-

Be it known that l, \VILLARD L. HALL, a citizen of the United States, residing at Fremont, in the county of Dodge and State of Nebraska, have invented a new and useful Lifting-Jack, of which the following is a specification, reference beinghad to the accompanying drawings.

My invention relates to lifting-jacks; and it has for its object to provide a device of this character which shall be capable of lifting weighty objects with but a minimum expenditure of power.

A further object of the invention is to pro vide a device of this character which shall be cheap and simple in its construction, and one in which the working parts will not be likely to get out of order.

With these ends in view the invention consists in the improved construction and combinations of parts hereinafter fully described, and pointed out in the claims.

In the drawings, Figure 1 is a perspective view of a lifting-jack constructed in accordance with my invention. Fig. 2 is a longi tudinal vertical section of the same; and Fig. 3 is a side elevation showing the jack lowered or in its normal position.

In the accompanying drawings, in which like letters refer to corresponding parts in the figures, A represents a supporting-frame, consisting of the lower or base strip, 13, having secured to its sides, near the end thereof, two converging uprights, a, and at its other end a converging upright, b. To the uprights a and b are secured cross-strips c, which are secured to the outer sides of the upright b, and to the inner sides of the uprights a. As these crossstrips 0 are secured to the outer sides of the uprights a, a block, cl, is secured between the ends of the same in order that they may be suitably braced. I p

0 represents uprights or braces, which are secured to the sides of the cross-st rips 0 at their upper ends, and to the sides of the base-stri p A at their lower ends.

D represents two metal plates, which are pivoted to the sides of the upright b, a short distance from the base A at one end, and upon a bolt, 0, of a vertically-moving upright, E, at the other end. This vertically-moving upright is provided at its upper end with an angular portion,f, to form a seat for a vehicle atle when the sameis to be raised. Upon the opposite side of the vertically-moving upright E, and upon the bolt 6, are pivoted two metal plates, g, Whlth are rigidly connected or secured at their other ends to the lifting-lever F. H H 1 eprtsent metal plates secured to the sides of the lever F, and pivoted upon the bolt 0, respectively, and converging to form a bracket. These plates H H are connected at their lower ends by means of a transverse bolt, upon which is mounted aroller, I, which works upon a slightly-inclined base or. strip, J, secured to the upper side of the base A.

The operation is as follows: The jack, as

shown in Fig. 3its normal position-is placed under the axle, and upon the lever F being depressed the roller 1 is caused to revolve upon the strip or track J, the vertically-moving upright being slightly raised, however, before the roller commences its forward movement, by means of the pivoted plates g, the roller forming the fulcrum. The roller then moves forward, and passes a short distance beyond the vertical center of the verticallymoving upright, so that the device is thoroughly locked in an upright position, as shown in Fig. 1. To lower the verticallymoving upright which supports the axle, it is only necessary to raise the lever slightly, when the upright E will descend by the weight of the vehicle in connection with which it is to be used; the downward movement of course being regulated by the operator.

It will be apparent from the above description that a lifting-jack constructed in accordance with my invention is capable of lifting heavy weights with but little exertion on the part of the operator. It will also be seen that all strain falls directly vertical, thus obviating anytwisting or wrenching of the supporting-frame. It will be further apparent that the device above described is simple in its construction, and that the parts may be manufactured of wood with the exception of the plates hereinbefore described, thus enabling the same to be produced at a comparatively slight cost.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a lifting-jack, the combination, with a vertical upright, of a lever connected thereto, and a roller journaled between said upright and lever, substantially as set forth.

2. In a lifting-jack, the combination, with a vertical upright, of a lever connected thereto, a roller journaled between said upright and lever, and plates secured to the lower end of said upright, and to the beam b, substantially as set forth.

3. In a lifting-jack, the combination, with a vertical upright, of a lever pivoted thereto by means of metal plates, a roller journaled between plates secured rigidly to the said lever and plates pivoted to the vertical upright, and plates pivoted to the lower end of the vertical upright at one end, and to the upright I) at their other ends, substantially as set forth.

4. In a lifting-jack, the combination, with the vertical upright, of a lever pivoted thereto, a roller journaled between said upright and lever, and an inclined strip upon which the said roller is adapted to move, substantially as set forth.

, 5. In a lifting-jack, the combination, with a supporting-frame having guides at its upper end,ofa vertically-moving upright mounted between said guides, a lever pivoted there- WILLARD L. HALL.

WVitnesses:

WESLEY WV. KING, GILMORE W. KING. 

